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POProgress for DBCC SHRINKFILE
 

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  1. POProgress for DBCC SHRINKFILE
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    <p>I have a <strong>database 21 Gb; 20 Gb of them are files (FileStream)</strong> and I have delete all files from the table but when I make a backup the <strong>backup file still 21 GB</strong>.</p> <p>To solve this problem I became the idee "free the unused space".</p> <p>So I'm trying to <strong>shrink</strong> my database like the following:</p> <pre><code>USE Db; GO -- Truncate the log by changing the database recovery model to SIMPLE. ALTER DATABASE Db SET RECOVERY SIMPLE; GO -- Shrink the truncated log file to 1 MB. DBCC SHRINKFILE (Db, 100); GO -- Reset the database recovery model. ALTER DATABASE Db SET RECOVERY FULL; GO SELECT file_id, name FROM sys.database_files; GO DBCC SHRINKFILE (1, TRUNCATEONLY); </code></pre> <p>If I make a backup for the database after XX minutes then the backup file size is 1 Gb in this way, I can see that the unused space have been successfully cleaned. In other words the above Sql code working properly(<em>Database after XX minutes is schrunk</em>).</p> <hr> <p><strong>The problem</strong> I need to wait until this query(Shrinking operation) is finished so I'm trying to do the following:</p> <pre><code>SELECT percent_complete, start_time, status, command, estimated_completion_time, cpu_time, total_elapsed_time FROM sys.dm_exec_requests </code></pre> <p>I can not find any information about the SHRINKFILE command in results of the above query.</p> <p><img src="https://i.stack.imgur.com/mU1Vs.png" alt="enter image description here"></p> <hr> <p><strong><em>Did I do something wrong? why I can not see the progress of DB shrinking operation?</em></strong></p> <p><strong><em>And my main quesiton is: How can I wait until the SHRINKFILE is finished?</em></strong> For example can I send from my C# code query and in the result of this query I shall get the information that the SHRINKFILE operation is finsihed or not?</p>
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    1. USBassam Alugili
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    1. COYou do realize that this both fragments your database and breaks the log chain, right? This is not something that you should *ever* automate because 1) you should *never* automate shrinking a database, and 2) Your database recovery capability is in jeopardy until you finish the next full backup. You should only ever do this manually, on an exception basis, and personally watch over it until it is done. Otherwise you are inviting a host of problems, some of them disastrous.
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    2. COI agree with in all; That why I need to block everything changing the database while shrinking for example add remove entries backup, etc. The problem this is our customer requirements they need the unused space on the harddisk I must do it.
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    3. COFor me is also enough just to know when this process is finished and not a progress bar all I need to know When ShrinkFile operation is finished in SQL statement for example the process SPID not available anymore and I can pool that from C#
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